Honors College Thesis
 

Investigating heartworm infection in dogs : combining publicly available dog testing data with mosquito surveillance

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https://ir.library.oregonstate.edu/concern/honors_college_theses/rv0432794

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  • Oregon dogs are susceptible to heartworm, Dirofilaria immitis, a parasitic roundworm. D. immitis infects the cardiopulmonary system and reproduce within the animal, growing up to 30 cm. Dirofilaria repens is a filarial nematode that infects dogs, cats, wolves, coyotes, sea lions, and muskrats. It is also spread by mosquitos and acts similarly to D. immitis, but it is not typically found in the United States. Unlike D. immitis, D. repens can infect humans successfully, but roundworms are unable to reach maturity inside the human heart. Oregon has a variety of climates and weather patterns, making transmission dynamics variable throughout the state. Through analysis of a compilation of yearly test results reported by the Companion Animal Parasite Council (CAPC), as well as qPCR testing of seasonal pools of mosquitos collected by vector surveillance for West Nile Virus from counties within Oregon, we were able to gather information about the seasonal composition of mosquito populations in different areas of Oregon and which of those are more likely to carry D. immitis and D. repens. Ultimately, no vectors tested positive for D. immitis in the Willamette Valley, but the CAPC data identified a significant increase in the number of positive canine heartworm cases in Oregon.
  • Keywords: Heartworm, dog, Dirofilaria immitis, Dirofilaria repens, mosquito
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